:root{
  --green:#07c160; --green-d:#05a052; --ink:#16181d; --ink-2:#5b6270; --ink-3:#8d95a3;
  --line:#e9ecf1; --bg:#f4f6f9; --card:#ffffff; --warn:#ff8f1f; --red:#f04b4b;
  --radius:16px; --shadow:0 2px 10px rgba(20,30,60,.06);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); font-size:15px; line-height:1.5;
  padding-bottom:96px;
}
h1,h2,p,ul,li{margin:0;padding:0}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;font-size:inherit;color:inherit}
b{font-weight:600}

/* ---------- 顶部 ---------- */
.hero{
  background:linear-gradient(160deg,#0aa85c 0%,#07c160 55%,#28cf74 100%);
  color:#fff; padding:18px 16px 22px; border-radius:0 0 22px 22px;
  box-shadow:0 6px 18px rgba(7,193,96,.25);
}
.hero-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.brand{display:flex;align-items:center;gap:9px}
.brand .logo{
  width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,.22);
  display:grid;place-items:center;font-size:18px;backdrop-filter:blur(4px);
}
.brand h1{font-size:16.5px;font-weight:700;letter-spacing:.2px}
.brand p{font-size:11.5px;opacity:.85;margin-top:1px}
.who{
  background:rgba(255,255,255,.2);border-radius:20px;padding:5px 11px;font-size:12px;
  white-space:nowrap;backdrop-filter:blur(4px);
}
.hero-stats{display:flex;gap:8px;margin-top:16px}
.stat{
  flex:1;background:rgba(255,255,255,.16);border-radius:12px;padding:9px 10px;
  backdrop-filter:blur(4px);
}
.stat .k{font-size:11px;opacity:.86}
.stat .v{font-size:16px;font-weight:700;margin-top:2px}
.stat .v small{font-size:11px;font-weight:500;opacity:.9}
.notice{
  margin:12px 12px 0;padding:9px 12px;border-radius:12px;background:#fff8ec;color:#8a5a00;
  font-size:12.5px;display:flex;gap:7px;align-items:flex-start;border:1px solid #ffe6c2;
}
.notice b{color:#c96a00}

/* ---------- 分组卡片 ---------- */
#groups{padding:12px 12px 0;display:flex;flex-direction:column;gap:12px}
.group{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.group-head{
  display:flex;justify-content:space-between;align-items:flex-start;gap:10px;
  padding:13px 13px 10px;border-bottom:1px solid var(--line);
}
.gh-left{display:flex;gap:9px}
.gh-icon{font-size:17px;line-height:1.2}
.group-head h2{font-size:14.5px;font-weight:700}
.group-head p{font-size:11px;color:var(--ink-3);margin-top:3px;line-height:1.45}
.gh-right{display:flex;flex-direction:column;align-items:flex-end;gap:6px;flex-shrink:0}
.gh-count{font-size:11px;color:var(--green-d);background:#eafaf1;padding:2px 7px;border-radius:20px;white-space:nowrap}
.mini{
  font-size:11.5px;color:var(--ink-2);border:1px solid var(--line);border-radius:8px;padding:3px 9px;background:#fafbfc;
}
.books{padding:4px 0}
.book{
  display:flex;align-items:center;gap:11px;padding:11px 13px;border-bottom:1px solid #f2f4f7;
  transition:background .15s;position:relative;
}
.book:last-child{border-bottom:none}
.book.on{background:#f6fdf9}
.book input{width:19px;height:19px;accent-color:var(--green);flex-shrink:0}
.book-main{flex:1;min-width:0}
.book-name{font-size:13.5px;line-height:1.4;color:var(--ink)}
.book.on .book-name{font-weight:600;color:#0a7a41}
.book-meta{display:flex;gap:7px;align-items:center;margin-top:4px;flex-wrap:wrap}
.price-old{font-size:11px;color:var(--ink-3);text-decoration:line-through}
.disc{font-size:10.5px;color:#c0392b;background:#fdeceb;border-radius:5px;padding:1px 5px}
.tag{font-size:10.5px;color:#2f6bed;background:#eaf1fe;border-radius:5px;padding:1px 5px}
.book-price{font-size:14.5px;font-weight:700;color:var(--ink);white-space:nowrap}
.book.on .book-price{color:#0a7a41}
.group-foot{
  padding:9px 13px;background:#fafbfc;font-size:12px;color:var(--ink-2);
  display:flex;justify-content:flex-end;gap:5px;border-top:1px solid var(--line);
}
.group-foot b{color:var(--ink)}

/* ---------- 底部结算栏 ---------- */
.bar{
  position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.97);
  backdrop-filter:blur(12px);border-top:1px solid var(--line);
  padding:9px 13px calc(9px + env(safe-area-inset-bottom));
  display:flex;align-items:center;gap:11px;box-shadow:0 -3px 14px rgba(20,30,60,.07);
}
.bar-l{flex:1;min-width:0}
.bar-l .t{font-size:11.5px;color:var(--ink-3)}
.bar-l .p{font-size:19px;font-weight:800;color:#e8452c;line-height:1.2}
.bar-l .p small{font-size:11px;font-weight:500;color:var(--ink-3);margin-left:5px}
.bar-l .save{font-size:11px;color:var(--green-d);background:#eafaf1;border-radius:6px;padding:1px 6px;display:inline-block;margin-top:3px}
.cta{
  background:linear-gradient(135deg,#07c160,#04a851);color:#fff;font-size:15px;font-weight:700;
  padding:11px 24px;border-radius:26px;box-shadow:0 4px 12px rgba(7,193,96,.35);white-space:nowrap;
}
.cta:disabled{background:#c8cdd6;box-shadow:none;color:#fff}

/* ---------- 结账页 ---------- */
#view-checkout{padding:12px 12px 0;display:flex;flex-direction:column;gap:12px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;position:relative}
.card h3{font-size:14px;font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.kv{display:flex;justify-content:space-between;font-size:13px;padding:6px 0;border-bottom:1px dashed #eef1f5}
.kv:last-child{border-bottom:none}
.kv .k{color:var(--ink-2)}
.kv .v{font-weight:600}
.big-total{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-top:8px;padding-top:10px;border-top:2px solid #f0f2f5;
}
.big-total .k{font-size:13px;color:var(--ink-2)}
.big-total .v{font-size:26px;font-weight:800;color:#e8452c}
.pay-card{text-align:center;background:linear-gradient(180deg,#f7fffb,#fff)}
.qr-wrap{
  width:214px;height:214px;margin:6px auto 0;border-radius:14px;overflow:hidden;
  border:1px solid var(--line);background:#fff;display:grid;place-items:center;
}
.qr-wrap img{width:100%;height:100%;object-fit:cover;object-position:50% 41%}
.payee{font-size:13px;color:var(--ink-2);margin-top:10px}
.payee b{color:var(--ink)}
.pay-note{
  margin:10px 0 0;background:#fff7e6;border:1px solid #ffe2b0;color:#8a5a00;
  font-size:12.5px;border-radius:10px;padding:8px 10px;line-height:1.55;
}
.pay-note b{color:#d9480f;background:#fff;border-radius:5px;padding:1px 5px}
.paid-box{font-size:12px;color:var(--ink-3);margin-top:10px}
.paid-box.done{color:var(--green-d);font-weight:600}
.btn-row{display:flex;gap:9px;margin-top:12px}
.btn{
  flex:1;padding:12px;border-radius:12px;font-size:14px;font-weight:600;text-align:center;
  border:1px solid var(--line);background:#fff;color:var(--ink);
}
.btn.primary{background:linear-gradient(135deg,#07c160,#04a851);color:#fff;border:none}
.btn.wide{flex:none;width:100%}
#ck-items li{display:flex;gap:8px;font-size:12.5px;padding:6px 0;border-bottom:1px dashed #eef1f5;align-items:flex-start}
#ck-items li:last-child{border-bottom:none}
#ck-items .idx{color:var(--ink-3);font-size:11px;min-width:16px}
#ck-items .nm{flex:1;color:var(--ink-2);line-height:1.45}
#ck-items .pr{font-weight:600;color:var(--ink)}

/* ---------- 顶部条 ---------- */
#topbar{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:10px 13px;display:flex;align-items:center;gap:10px;
}
#topbar .ttl{font-size:14.5px;font-weight:700;flex:1}
.icon-btn{font-size:13px;color:var(--ink-2);padding:4px 8px;border-radius:8px;background:#f3f5f8}

.chip{font-size:10.5px;padding:2px 7px;border-radius:20px;white-space:nowrap}
.chip-normal{background:#eaf1fe;color:#2f6bed}
.chip-fast{background:#fdeceb;color:#c0392b}

/* ---------- 首次填写弹层 ---------- */
.modal{
  position:fixed;inset:0;background:rgba(15,20,30,.5);display:grid;place-items:center;
  padding:20px;z-index:50;backdrop-filter:blur(3px);
}
.modal[hidden]{display:none}
.sheet{
  background:#fff;border-radius:20px;padding:20px 18px;width:100%;max-width:360px;
  box-shadow:0 20px 50px rgba(0,0,0,.25);
}
.sheet h2{font-size:17px;font-weight:800;margin-bottom:4px}
.sheet .sub{font-size:12.5px;color:var(--ink-3);margin-bottom:16px;line-height:1.5}
.field{margin-bottom:12px}
.field label{display:block;font-size:12.5px;color:var(--ink-2);margin-bottom:5px;font-weight:600}
.field input{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:11px;font-size:15px;
  background:#fafbfc;outline:none;transition:.15s;font-family:inherit;
}
.field input:focus{border-color:var(--green);background:#fff;box-shadow:0 0 0 3px rgba(7,193,96,.12)}
.tracks{display:flex;gap:9px}
.tracks label{
  flex:1;border:1.5px solid var(--line);border-radius:12px;padding:10px;cursor:pointer;
  background:#fafbfc;transition:.15s;
}
.tracks input{display:none}
.tracks label.on{border-color:var(--green);background:#f2fdf7}
.tracks .tn{font-size:13.5px;font-weight:700}
.tracks .td{font-size:11px;color:var(--ink-3);margin-top:2px}
.hint{font-size:11.5px;color:var(--ink-3);line-height:1.5;margin-top:10px}

/* ---------- 提示 / 加载 ---------- */
.toast{
  position:fixed;left:50%;top:14px;transform:translate(-50%,-16px);z-index:120;
  background:rgba(22,24,29,.94);color:#fff;font-size:13px;line-height:1.5;padding:11px 15px;
  border-radius:12px;max-width:88vw;opacity:0;pointer-events:none;transition:.28s;
  box-shadow:0 8px 26px rgba(0,0,0,.3);text-align:center;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media (max-width:520px){ .toast{max-width:92vw} }
.toast.ok{background:rgba(5,160,82,.96)}
.toast.err{background:rgba(214,58,58,.96)}
.loading{
  position:fixed;inset:0;z-index:90;background:rgba(255,255,255,.62);backdrop-filter:blur(2px);
  display:flex;align-items:center;justify-content:center;gap:10px;font-size:13.5px;color:var(--ink-2);
}
.spinner{
  width:19px;height:19px;border:2.5px solid #d6dbe3;border-top-color:var(--green);
  border-radius:50%;animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.saved-chip{font-size:11px;font-weight:500;color:#c96a00;background:#fff3e6;border-radius:20px;padding:2px 8px;margin-left:auto}
.saved-chip.on{color:#0a7a41;background:#eafaf1}
.pay-amount{font-size:24px;font-weight:800;color:#e8452c;text-align:center;margin:2px 0 8px}
.footnote{font-size:11.5px;color:var(--ink-3);line-height:1.6;padding:2px 4px 8px}
.tool.ghost{background:#fff;color:var(--ink-2)}

/* ---------- 班长入口（页面最底部，收起在灰字里，同学看不到密码进不去） ---------- */
.admin-entry{
  display:flex;align-items:center;justify-content:center;gap:8px;
  font-size:11.5px;color:#b3bac6;padding:22px 0 10px;
}
.admin-entry a{color:#8d95a3;text-decoration:none;border-bottom:1px dashed #cfd5de;padding-bottom:1px}
.admin-entry a:active{color:var(--green-d)}